Plastic mold assembly points

Plastic mold assembly points
There are many varieties of plastic molds. Even for the same type of mold, due to different types of plastics, the initial and precision requirements are different, and the installation methods are also different. Therefore, before assembly, you should carefully study and analyze the assembly drawing. Parts diagram, understand the effect of each part, Characteristics and skill requirements, and confirm the installation benchmark. After installation, all quality indicators of the product, mold movement accuracy and various skill requirements during use are finally fully reached.
1. Installation benchmarks, installation benchmarks can be roughly divided into
(1) The main working parts in the plastic mold such as core, cavity and insert are used as the reference parts for installation, and other parts of the mold have installation reference parts for manufacture and installation.
(2) Trim and install with the guide column guide sleeve or the template side base surface of the mold as the installation reference plane.
2. Mold installation accuracy, mold installation accuracy includes
(1) The mutual accuracy of each part and component, such as distance scale accuracy, coaxiality, equality, straightness, etc.
(2) Relative motion accuracy, such as transmission accuracy linear motion and reverse motion accuracy, etc.
(3) Cooperation accuracy and touch accuracy, such as cooperation gap, interference touch situation, etc.
(4) The wall thickness of the plastic forming part. When making a new mold, the wall thickness of the forming part should be biased towards the lower limit of the size.
3. Repair principle
(1) To modify the draft angle, in principle, the cavity should ensure that the large end size is within the common tolerance of the workpiece size, and the core should ensure that the small carbonyl size is within the common tolerance of the workpiece size.
(2) For the fillet radius at the corner, the cavity should be small and the core should be large.
(3) When the mold has both a horizontal parting surface and a vertical parting surface, the vertical parting surface should have a slight gap when it touches the horizontal parting surface. Just touch each other after red, the large mold gap is about 0.02mm.
(4) For the mold with bevel clamping, after the bevel is closed, there should be a gap of 0.02-0.03mm at the parting surface.
(5) The connection between the arc and the straight line on the repair surface should be smooth, the surface should not have dents, and the filing pattern should be the same as the mold opening direction.

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